/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/HierarchyEditor/NiagaraHierarchyViewModelBase.h
[FReply](API\Runtime\SlateCore\Input\FReply) OnDragDetected ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & Geometry, const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & PointerEvent, bool bIsSource )